Field Health Officer: Investigator, communicable disease Investigates reported cases of communicable diseases and advises exposed persons to obtain medical treatment and to prevent further spread of disease: Locates and interviews exposed person, using information obtained from records of state or local public health departments and from individual already under treatment for communicable disease. Advises person to obtain treatment from private physician or public health clinic. May also take blood sample to assist in identifying presence of disease in suspected victim. Questions exposed person to obtain information concerning other persons who may also have received exposure. Conducts follow-up interviews with patients and suspected carriers. Writes report of activities and findings. Visits physicians, laboratories, and community health facilities to stimulate reporting of cases and to provide information about government-sponsored health programs concerning immunization efforts, VD control, mosquito abatement, and rodent control.